Which statement is incorrect about the singly linked list?

Select one:

$$ A node in a singly linked list referencing None as its next is definitely the last node

$$ The data of a node in a single linked list can reference any type of object

$$ The size of each node in a singly linked list is not fixed and can be larger or smaller depending on the type of object that data in the node is referring to$.$

$$ A node in a singly linked list that is not the last node contains reference to another instance of the same class